Applications of the Differential Eignevalue Problem

dev00790
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Homework Statement



following from this post; https://www.physicsforums.com/showthread.php?t=312075", I would like to know why people generally think the Differential Eigenvalue Problem is interesting? eg why is there a fair amount of current research into this?

Homework Equations



\lambda y = Ly, where L is a linear operator, \lambda is an eigenvalue. y is an eigenfunction corresponding to the eigenvalue.

The Attempt at a Solution



Searched Google, wikipedia, encylc. Britannica.

I know that large systems are hard to solve for the differential eigenvalue problem, so i am presuming this is partly why the research effort. But I'm stabbing in the dark. - I need something in detail please. Or a site / book where i can find the information?

Thanks :)
 
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I can give you one example... One of the most important equations in Quantum Physics is the Schrodinger Equation, which is basically a differential eigenvalue problem.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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